QNAP TS-451 4-Bay Personal Cloud NAS, Intel 2.41GHz Dual Core CPU with Media Transcoding (TS-451-US) 2.41 GHz Intel Celeron D Processor 360 1 GB DDR3 Linux. Sound Level : Sound pressure (LpAm): 16.9 dB(A) Build a personal karaoke system with Ocean KTV ; Linux Station supports Ubuntu with direct output via HDMI and Operating Temperature 0-40C, Relative Humidity 5~95% RH non-condensing, wet bulb: 27C A hybrid approach to virtualization: Virtualization Station & Container Station ; Supports Virtual JBOD (VJBOD) to maximize the storage utilization of multiple QNAP NAS units Transcode Full HD videos on-the-fly or offline Play 1080p videos with 7.1 channel surround sound pass-through via HDMI output Create a personal cloud and stream your multimedia library via DLNA, AirPlay, and PLEX Centralize your file storage, sharing and backup Run a virtual machine and extend the functionality of the NAS with an integrated virtualization solution Expand the total raw storage capacity up to 60TB (with maximum 12 hard drives) with the economical QNAP expansion enclosure UX-800P